Chuck.



No. 795,234. PATENTED JULY 18, 1905. J. G. POTTER & J. JOHNSTON.

CHUCK.

APPLICATION FILED JUNE 20. 1900.

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CHUCK,

APPLICATION FILED JUNE 20. 1900.

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ANDRDZV/ n cmuua m. nhmlmnmnmm w/wlscrounc UNITED STATES Patented July is, 1905.

PATENT OFFICE.

JAMES C. POTTER AND JOHN JOHNSTON, OF PAIVTUCKET, RHODE ISLAND,

ASSIGNORS TO POTTER AND JOHNSTON MACHINE COMPANY, OF PAW- TUCKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 795,234, dated July 18,1905.

Application filed June 20, 1900. Serial No. 20,967-

To all 7071/0112, it may concern:

Be it known that we, JAMEs C. POTTER and JOHN JOHNSTON, of Pawtucket, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Chucks; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which Figure 1 is a side View of our improved chuck. Fig. 2 is a front view, partly in section, of the same. Fig. 3 is a sectional view of part of the chuck, showing the operative mechanism by which the dog is adjusted and operated. Fig. 4 is a view of part of the chuck, showing the ring by which the dogs are adjusted simultaneously in connection with the gears secured to the end of the screw-spindle, and Fig. 5 is a transverse sectional view of part of the chuck, showing the rack-bar in connection with the pinion-gear on the screw-spindle.

The object of our invention is to so construct lathe-chucks as to enable the jaws thereof to be adjusted and operated easily and quickly; have the operating mechanism housed, so as to be protected from the access of dust, chips, &c., and enable oil to be contained for lubricating purposes; to eliminate danger to the hand or clothing of the workman, and to enable a chuck to be used with lathes difiering in construction; and to these ends our invention consists in the chuck having the construction substantially as hereinafter specified.

In the carrying of our invention into practice the body a of the chuck has the form of a ring or annulus, on one side of which are radially-extending ways a, slidingly fitted in which are slides b, to which the dogs or jaws are attached. On the opposite side of the body a is a sleeve a whose interior a is tapered, so that its diameter decreases from its outer end toward the body a, and in said sleeve is an internally-threaded collar a whose exterior is tapered in correspondence with the taper of the sleeve to closely fit the latter. A screw-pin a, passing through the sleeve a into the collar (i holds the latter from turning in the sleeve. The collar a, by its thread, forms the means for attaching the chuck to the lathe-spindle, and as it is removable from the chuck other collars may be substituted for it having an internal diameter or a pitch of the screw-thread to suit a'spindle differing in these particulars, thus enabling the chuck to be used with lathes having spindles that vary either in respect to diameter or pitch of screw-thread. For each slide 1) there is a screw-spindle having portions which respectively engage brackets b" and b on the inner side of the slide, the portion 6 that engages the thread of the bracket 1), being of larger diameter than the portion 6 which engages the thread of the bracket 6 and on the spindle, between its two portions of different diameter, is a pinion b that engages the rack-teeth on the rack-bar, slidingly mounted in an opening extending longitudinally of the sleeve a and connected by a pin d with a collar (1 slidably mounted on the exterior of the sleeve cf, the construction being such that when said collar is moved by its operating-lever the rack-bars will be simultaneously moved and all of the slides and the dogs or jaws simul taneously moved.

Encircling and closely fitting the chuckbody a is a ring 0, that is drawn to and held in position on the body a by one or more screws 0, and in line with each slide-operating spindle said ring 0 has a bushing 0 that forms the bearing of a stem 1), having at its inner end a .disk provided with a rib or ribs to en age a groove or grooves in the outer end oi the slide-spindle, so that the two spindles turn together. On its outer end the stem 5 has a bevel-pinion 0 which meshes with a ring-rack c, that fits the periphery of the ring 0 with a sliding fit. On its outer side the ring-rack has a flange in' which are one or more holes or sockets c for the inser tion of a tool by which to revolve the ringrack, and engaging the ring and its flange on one side to confine it in place is a flange 0 on the ring 0, whose diameter is the same as the diameter of the ring -flange, while engaging the ringdiange on the opposite side is a ring 0 that houses or covers the rack and pinions and also has an external diameter the same as that of the ring-flange. It will be perceived that the exterior periphery of the chuck is, therefore, perfectly free from projections and smooth, so that no danger exists of the clothing or hands of the operator being injured. Within and tightly fitting the chuck-body a is a ring a and on the periphery of the ring for engagement by the inner end of each slide-operating spindle is a hardsteel bearing 0". It will be seen that the ring a sustains the thrust of the s aindle-operating screw in one direction, while the ring 0 sustains the thrust in the opposite direction, and that both rings close the ends of the ways a.

By reason of the loose connection between the spindles b and their stems l)" the separation of the spindles with their jaws from the adjusting mechanism and the assemblage of these parts can be most readily effected.

It will be seen that the operating mechanism of the chuck is completely housed, so that the entrance of dirt, chips, &c., thereto is excluded and so that lubricating-oil placed within the spaces or chambers within the chuck is kept therein, the fitting of the parts being so close as to make the joints oil-tight.

It is to be noted that by our construction the chuck-jaws are simultaneously moved to clamp or free the work, and they are simulta neously adjustable. l/Vhen the jaws are to be adjusted, the operating-racks are disengaged from the pinions 12".

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. A chuck, having ways for jaws, and an overhanging portion on its exterior, stems journaled in the overhanging portion and having means whereby they may be rotated, screws, jaws threaded thereon, the upper ends of the screws and the inner ends of the stems having detachable, interlocking engagement, and means for retaining them in detachable engagement.

2. A chuck, having ways for jaws, and an overhanging portion on the exterior, stems journaled in the overhanging portion, and having means whereby they may be rotated, screws, aws threaded thereon, the upper ends of the screws and the inner ends of the stems having detachable, interlocking engagement, and a bushing forming a bearing for the inner ends of the screws.

3. In a lathe-chuck, the combination with the main body of the chuck and a rearwardlyextending sleeve, of the tapering inner sur face of the sleeve, the internally-screwthreaded collar, the outer surface of which corresponds to the tapering inner surface of the sleeve, and a fastening device extending into the body of the sleeve and the collar, whereby a collar fitting the screw-thread of the spindle may be secured in the sleeve, as

described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JAMES C. POTTER. JOHN JOHNSTON. Witnesses J. A. MILLER, J12, A. E. HAGERTY. 

